Codex, Behind the Harness: Dominik Kundel on OpenAI's Codex
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In an AI Engineer talk, OpenAI's Dominik Kundel explains how Codex switched to websocket mode when GPT 5.3 Codex Spark hit 1,000 tokens/sec on Cerebras, making inference no longer the bottleneck. The persistent connection carries stateful context, shipping only the turn's changes.
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